code: def onnx_opset_version() -> int:
      """Return current opset for domain `ai.onnx`."""
      return C.schema_version_map()[ONNX_DOMAIN][1]
  
file_path: onnx/onnx/defs/__init__.py
imports: from typing import List
  import onnx.onnx_cpp2py_export.defs
  from onnx import AttributeProto, FunctionProto
label_desc: Use image node_id 1 for calling a global function with example usage: onnx_opset_version() and returns: C